Lithium battery CR 2450 Practical control of smart + products without smartphone and internet (smartphone and internet only necessary for configuration) Wall switch and remote control in one / Simple and flexible mounting with magnetic wall plate Customizable remote key functions / Each of the 4 keys has 2 configurable functions, short and long key press Applications: groups, on / off, wireless dimming, control of colour like Smart + RGB or Tuneable White, scene selection